<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			#hd{
				width: 800px;
				height: 300px;
				background: purple;
				position: absolute;
				top: 0;
				left: 0;
				opacity: 0.3;
				/*filter是专门给ie看的*/
				filter: alpha(opacity=30);
				
				
			}
		</style>
	</head>
	<body>
		<h1>后盾人 人人做后盾</h1>
		<div id="hd">
			
		</div>
		
		
		
	</body>
</html>
